I read the cave was a familiar place to the team. They had made trips there before. What puzzles me is (and will be answered when the coach is properly interviewed):
The group walked to the place they're at now, several kilometres from the mouth of the cave. How did the situation develop to the present state? It's been said they were there to get temporary shelter from the rain, so they did know how the weather was, and being a local, the coach should have known the rains can collect huge amounts of water in the mountain gulches in a short time. Now the route they used that most likely is quite usable on foot, is deadly dangerous for divers. Some really poor decision made on the way, one can assume.
Two finnish cave divers died two years ago in a Norwegian cave, and the bodies we're left there, and diving in the cave was forbidden. International rescue team decided it's too dangerous to try to take the corpses up. A group of finnish divers, friends of the dead ones, made a rescue operation secretly and got the bodies home. The documentary of the operation is breathtaking. I can't but admire the nerves (or the lack of nerves) of those people.
Let's hope the end of this story is at least as happy as that of the one in Chile.